How to merge intersections in a text?
Assuming that the characters of the word are single object, because you want them one object ... so they aren't one object...

Select F and assign a boolean modifier.
For the "object" (see the modifiers panel) assign the "l".
Set mode to "union".
Apply the modifier.
That will give you one object consisting of "Fl" and the "l", which had
not modifier assigned to it...delete the "l".
Now do the same with the "Fl"-object (assign modifier to it) and the "o",
apply, remove the "o". Now "Flo" and the "w" and so on.